﻿#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>
#include <string.h>
using namespace std;

class Solution {
public:
    void reverseString(vector<char>& s) {
        int left = 0, right = s.size() - 1;
        while (left < right)
        {
            swap(s[left], s[right]);
            left++;
            right--;
        }
    }
};

int main()
{
    queue<int> qt;
    queue<int>& out = qt;
    cout << out.size();
    return 0;
}